Transformer Sizing Center

Your transformer is the engine of your landscape. Calculate your total system load and apply the 80% safety rule to find the ideal power capacity for peak performance and future expansion.

Transformer Sizing Tool

Step 1: Total Your Wattage
Add up the actual wattage (or VA) of every fixture in your design.

Step 2: Add Safety Buffer
We automatically apply a 20% "Expansion Buffer" to ensure system health.

Total System Wattage (W)

Transformer Knowledge Base

SAFETY FIRST The 80% Capacity Rule

Running a transformer at 100% capacity creates excessive heat and shortens the unit's lifespan. Professionals always leave 20% headroom. If your total load is 80W, use at least a 100W transformer.

PERFORMANCE Watts vs. VA

Modern LED specs often list VA (Volt-Amps). This is the "true" power draw. If a fixture says 3W but 5VA, always use the 5VA in your math to prevent overloading the circuit.

PRO TRICK Future Expansion

Most homeowners want more lights next year. Sizing up to a 300W unit now is often only $40-$60 more than a 150W unit, but it saves you from buying a whole second transformer later.

PRO TRICK Stainless Steel Units

Cheaper plastic transformers warp in the sun and crack in the cold. A Stainless Steel magnetic transformer is a lifetime investment that handles outdoor elements much better.